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View synonyms for

all clear

noun

  1. the signal that an air raid or other danger is over.

all clear

noun

  1. a signal, usually a siren, indicating that some danger, such as an air raid, is over
  2. an indication that obstacles are no longer present; permission to proceed

    he received the all clear on the plan

“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of all clear1

First recorded in 1915–20

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